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Calculate the height and volume of a solid composed of a cone, cylinder, and hemisphere.

Mathematics

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Here are the calculations for the solid:

Given:
Diameter D=10 cmD = 10 \text{ cm}
Radius r=D2=102=5 cmr = \frac{D}{2} = \frac{10}{2} = 5 \text{ cm}
Height of cylindrical part hcyl=15 cmh_{cyl} = 15 \text{ cm}
Slant height of conical part l=13 cml = 13 \text{ cm}
π=3.142\pi = 3.142

a) Height of the solid

Step 1: Calculate the height of the conical part (hconeh_{cone}).
Using the Pythagorean theorem for the cone: l2=r2+hcone2l^2 = r^2 + h_{cone}^2.

132=52+hcone213^2 = 5^2 + h_{cone}^2 169=25+hcone2169 = 25 + h_{cone}^2 hcone2=169−25h_{cone}^2 = 169 - 25 hcone2=144h_{cone}^2 = 144 hcone=144=12 cmh_{cone} = \sqrt{144} = 12 \text{ cm}

Step 2: Determine the height of the hemispherical part (hhemih_{hemi}).
The height of the hemispherical part is equal to its radius.

hhemi=r=5 cmh_{hemi} = r = 5 \text{ cm}

Step 3: Calculate the total height of the solid.
The total height is the sum of the heights of the conical, cylindrical, and hemispherical parts.

Htotal=hcone+hcyl+hhemiH_{total} = h_{cone} + h_{cyl} + h_{hemi} Htotal=12 cm+15 cm+5 cmH_{total} = 12 \text{ cm} + 15 \text{ cm} + 5 \text{ cm} Htotal=32 cmH_{total} = 32 \text{ cm}

The height of the solid is 32.0 cm\boxed{\text{32.0 cm}}.

b) Volume of the solid, correct to 1 decimal place

Step 1: Calculate the volume of the conical part (VconeV_{cone}).

Vcone=13πr2hconeV_{cone} = \frac{1}{3} \pi r^2 h_{cone} Vcone=13×3.142×(5 cm)2×12 cmV_{cone} = \frac{1}{3} \times 3.142 \times (5 \text{ cm})^2 \times 12 \text{ cm} Vcone=13×3.142×25×12 cm3V_{cone} = \frac{1}{3} \times 3.142 \times 25 \times 12 \text{ cm}^3 Vcone=3.142×25×4 cm3V_{cone} = 3.142 \times 25 \times 4 \text{ cm}^3 Vcone=314.2 cm3V_{cone} = 314.2 \text{ cm}^3

Step 2: Calculate the volume of the cylindrical part (VcylV_{cyl}).

Vcyl=πr2hcylV_{cyl} = \pi r^2 h_{cyl} Vcyl=3.142×(5 cm)2×15 cmV_{cyl} = 3.142 \times (5 \text{ cm})^2 \times 15 \text{ cm} Vcyl=3.142×25×15 cm3V_{cyl} = 3.142 \times 25 \times 15 \text{ cm}^3 Vcyl=1178.25 cm3V_{cyl} = 1178.25 \text{ cm}^3

Step 3: Calculate the volume of the hemispherical part (VhemiV_{hemi}).

Vhemi=23πr3V_{hemi} = \frac{2}{3} \pi r^3 Vhemi=23×3.142×(5 cm)3V_{hemi} = \frac{2}{3} \times 3.142 \times (5 \text{ cm})^3 Vhemi=23×3.142×125 cm3V_{hemi} = \frac{2}{3} \times 3.142 \times 125 \text{ cm}^3 Vhemi=785.53 cm3V_{hemi} = \frac{785.5}{3} \text{ cm}^3 Vhemi≈261.8333 cm3V_{hemi} \approx 261.8333 \text{ cm}^3

Step 4: Calculate the total volume of the solid.

Vtotal=Vcone+Vcyl+VhemiV_{total} = V_{cone} + V_{cyl} + V_{hemi} Vtotal=314.2 cm3+1178.25 cm3+261.8333 cm3V_{total} = 314.2 \text{ cm}^3 + 1178.25 \text{ cm}^3 + 261.8333 \text{ cm}^3 Vtotal=1754.2833 cm3V_{total} = 1754.2833 \text{ cm}^3

Rounding to 1 decimal place:

Vtotal=1754.3 cm3V_{total} = 1754.3 \text{ cm}^3

The volume of the solid is 1754.3 cm3\boxed{\text{1754.3 cm}^3}.

c) Surface area of the solid, correct to 1 decimal place

Step 1: Calculate the curved surface area of the conical part (CSAconeCSA_{cone}).

CSAcone=πrlCSA_{cone} = \pi r l CSAcone=3.142×5 cm×13 cmCSA_{cone} = 3.142 \times 5 \text{ cm} \times 13 \text{ cm} CSAcone=3.142×65 cm2CSA_{cone} = 3.142 \times 65 \text{ cm}^2 CSAcone=204.23 cm2CSA_{cone} = 204.23 \text{ cm}^2

Step 2: Calculate the curved surface area of the cylindrical part (CSAcylCSA_{cyl}).

CSAcyl=2πrhcylCSA_{cyl} = 2 \pi r h_{cyl}
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